Move viewport unit resolution to style recalc time

Source/core/css/CSSCalculationValueTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
 
 using namespace WebCore;
 
 namespace {
 
 void testExpression(PassRefPtr<CSSCalcExpressionNode> expression, const RenderStyle* style)
 {
     EXPECT_TRUE(
         expression->equals(
             *CSSCalcValue::createExpressionNode(
-                expression->toCalcValue(CSSToLengthConversionData(style, style)).get(),
+                expression->toCalcValue(CSSToLengthConversionData(style, style, 0)).get(),
                 style->effectiveZoom()).get()));
 }
 
 TEST(CSSCalculationValue, CreateExpressionNodeFromLength)
 {
     RefPtr<RenderStyle> style = RenderStyle::create();
     RefPtr<CSSCalcExpressionNode> expected;
     RefPtr<CSSCalcExpressionNode> actual;
 
     expected = CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(10, CSSPrimitiveValue::CSS_PX), true);
@@ skipping 78 matching lines @@
                 CalcMultiply),
             CSSCalcValue::createExpressionNode(
                 CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(60, CSSPrimitiveValue::CSS_PX), true),
                 CSSCalcValue::createExpressionNode(CSSPrimitiveValue::create(0.75, CSSPrimitiveValue::CSS_NUMBER), false),
                 CalcMultiply),
             CalcAdd),
         style.get());
 }
 
 }